CXS or Litespeed ??

I'm using CXS for scanning uploaded files and prevent users from uploading malicious files on the server.
But recently my server load is growing and sometimes becomes too high (more than 20 or even 30) due to high traffics on apache.
My server manager suggesting me to get litespeed. But as you know litespeed does not support some mod_security rules that CXS using So CXS will not work with litespeed.

Thanks for the answer NiteWave
As you said, it seems CXS works only with apache.
But I knew that. My question is which one I have to choose? CXS or Litespeed ?
CXS for more security ? or Litespeed for more performance ?